Abstract

We measure the spin-lattice relaxation time as a function of sample temperature in GaAs in a real-time single-shot inversion recovery experiment using spin force gradients acting on a magnetic tipped cantilever. After inverting 69Ga spins localized near the magnet with a single 20 ms adiabatic rapid passage sweep, the spins’ magnetization recovery was passively tracked by recording the cantilever’s frequency change, which is proportional to the longitudinal component of the spins’ magnetization. The cantilever’s frequency was recorded for a time 3*T1 for sample temperatures ranging from 4.8 to 25 K. The temperature dependence was observed for the 69Ga quadrupolar relaxation interaction.

Received 21 February 2012Accepted 07 June 2012Published online 10 July 2012

Acknowledgments:

The authors would like to graciously thank Jeff Pulskamp for modeling the vibration behavior of parts of the probe head, Peter Newman for the GaAs crystal growth, Mathew Erwin for Au coating the sample, the DOE NNSA Office of Nonproliferation and Verification R&D for partial funding of the work, and Dr. Nicholas Fell for his support. Cantilevers were fabricated at the Cornell NanoScale Science and Technology Facility, a member of the National Nanotechnology Infrastructure Network, supported by the National Science Foundation (ECS-0335765). J.A.M. acknowledges the National Institutes of Health (5R01GM-070012) and S.A.H. and J.A.M. acknowledge the Army Research Office Multi-university Research Initiative (W911NF-05-1-0403).